Feul had to put lower grade gas in the car but didn't put much, notice that the car just didn't run right, well the service engine light came on then started to blink while going down the road, the car will sart up fine but i'm not getting any gas while stepping on the gas pedal

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This applies for any vehicle. Most of us know that gas prices arent exactly cheap right now and so we accomodate by purchasing cheaper gas, but here's some good info you should keep in mind. Fuel currently is mixed differently than it was back when there was the option for leaded gas. the past years low octane unleaded gas was cheap but well mixed and made, so most vehicles ran well off of it. Nowadays the mixing is different, and gas is more expensive. the low grade gas back then was good on cars and the newer gas not so much. our mid grade gas is the same as low grade from then. if you want to make your car run better, avoid going to arco, safeway, or any real cheap gas station. they water down their gas to make it cheaper, and its lower grade than most others, so instead of penny pinching, give your vehicle a break and instead of settling for low grade, pick the mid grade gas from stations like Shell or Chevron. i guarantee you will notice a performance difference and sometimes a gas mileage difference, especially in older vehicles that were built to run on the low to high grade unleaded of their times. its definitely worth the extra 10 cents.

sounds like either ur iac /or ur tps more then likly ur tps, throtle positioning sensor it controls ur feul intake more feul harder the engine runns, but iac idle air control it tells car more air higher idle less air tells tps less gas lower idle there all linked together have it put on a scanner that will narrow ur possiblities right down to the problem

A gearbox will not "knock" in the usual sense, that is said of an engine running on petrol which is a lower octane than it needs. The sound is more of a light rattle or pinging.

If your manual gearbox has had the wrong oil in it for only a week or 2 and has not been thrashed, it is unlikely it has been damaged at all. Just drain and refill with the right grade.

If an auto gearbox, using the wrong oil can cause damage, as it may be far too thick. Drain and refill 2-3 times with the correct grade, running the engine until warm, but not driving around, in between. Then go for a drive without thrashing the car, and see if you can notice anything abnormal.